Induction Healing of Porous Asphalt Concrete

摘要: Porous asphalt shows excellent performance in both noise reduction and water drainage. Although porous has these great qualities, its service life is much shorter (sometimes only half) compared to dense graded roads. Ravelling, which the loss of aggregate particles from surface layer, main damage mechanism wearing courses. In this research, an induction healing approach (namely, activating process concrete through heating) was developed enhance durability Steel fibers are added a mixture make it electrically conductive suitable for heating. When micro cracks expected occur mastic pavement, temperature can be increased locally by heating steel so that repair itself close high bitumen (diffusion flow). The closure will prevent formation macro cracks. such way, ravelling avoided or delayed end. To heating, (wool) were incorporated into them. electrical conductivity speed first studied research. Asphalt with heated energy. There optimal volume content fiber obtain highest speed. Adding more above does not increase anymore. Furthermore, corresponds minimum resistivity. However, need fully Every single wool unit. Nonconductive samples still but at low diameter, length important matrix. It proven cause extra ageing bitumen. Addition also reduces binder drainage problem concrete. mechanical properties moderate percentage reinforce increasing particle resistance, indirect tensile strength fracture energy, stiffness fatigue resistance. optimized best resistance 8% type 00 (volume fraction bitumen) considered as content. potential evaluated research cylinder beam samples. Damaged greatly restore stiffness, proves capacity enhanced 85 oC rate. Reheating decrease rate concrete, means repeated when appear again. apply technology real road, trial section constructed on Dutch motorway A58 December 2010. This survived past two winters perfectly. Experiments done cores drilled results coincided those laboratory made field showed good strength, capacity. Based experiments experiences, very pavement. Finally, some recommendations given further fiber, mixing generator optimized. Modeling work necessary understand mechanisms involved healing.